It was once the tallest building in the world and was named Sears. As of today, it is the
tallest building in the United States and bears the name Willis. But
whatever you want to call it, the 110-story tubular structure still
punctuates the downtown Chicago skyline like a boxy exclamation point....designslinger.com/2013/01/02/willis-tower.aspxThe boys in the studio have created a tribute to a great American skyscraper...Willis Blue Violet...www.designslingerstudio.com/prints_willisblueviolet.html